It's not just the volume level of some personal headphones that creates long-term hearing damage, its the distortion and sound pressure as well. Audio company dB Logic has introduced the EP-100 earphones for teens and adults that uses advanced circuitry to regulate volume, but maintain the integrity of the sound in a virtually transparent way. By getting cleaner sound without excessive volume, there is less need for listeners to expose themselves to excessive sound pressure levels, thus protecting their hearing while being able to listen longer.